If $\mathrm{△}ABC\sim \mathrm{△}DEF,\mathrm{\angle }A+\mathrm{\angle }B\backslash triangle\; ABC\; \backslash sim\; \backslash triangle\; DEF,\; \backslash angle\; A\; +\; \backslash angle\; B$ = 130°, then $\mathrm{\angle }F\backslash angle\; F$ = ………

$\mathrm{△}ABC\sim \mathrm{△}PQR,\backslash triangle\; ABC\; \backslash sim\; \backslash triangle\; PQR,$ If AB = 3.6, PQ = 2.4, PR = 5.4, then AC =

In $\mathrm{△}ABC,\overline{PQ}\parallel \overline{AB}\backslash triangle\; ABC,\; \backslash overline\{PQ\}\; \backslash parallel\; \backslash overline\{AB\}$ P, Q are on BC and AC. If CQ : QA = 1 : 3 and CP = 4, then BC =

If $\mathrm{△}ABC\sim \mathrm{△}DEF,\backslash triangle\; ABC\; \backslash sim\; \backslash triangle\; DEF,$ such that 2AB = DE and BC = 8 cm, then EF = ………. cm

$\mathrm{△}ABC\sim \mathrm{△}PQR,\backslash triangle\; ABC\; \backslash sim\; \backslash triangle\; PQR\; ,$ if AB = 6, BC = 4, AC = 8 and PR = 6, then PQ + QR = ……

The ratio of perimeters of two similar triangles is 4 : 9, then the ratio of their areas is ………

The perimeters of two similar triangles are 20 cm and 30 cm then the ratio of the areas of the triangles is ………

The areas of two similar triangles are 16 $c{m}^{2}cm^2$ and 25 $c{m}^{2}cm^2$ respectively, then the ratio of their corresponding sides is …………

$\mathrm{△}ABC\sim \mathrm{△}DEF\backslash triangle\; ABC\; \backslash sim\; \backslash triangle\; DEF$ . If BC = 3 cm, EF = 4 cm and ar $(\mathrm{△}ABC)(\backslash triangle\; ABC)$ = 54 $c{m}^{2}cm^2$then ar $(\mathrm{△}DEF)(\backslash triangle\; DEF)$ =

The ratio of altitudes of two similar triangles is 4 : 9, then ratio of their areas is